US7833312B2 - Method of drying an air dehumidifier - Google Patents

Method of drying an air dehumidifier Download PDF

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Publication number
US7833312B2
US7833312B2 US12/096,837 US9683707A US7833312B2 US 7833312 B2 US7833312 B2 US 7833312B2 US 9683707 A US9683707 A US 9683707A US 7833312 B2 US7833312 B2 US 7833312B2
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Prior art keywords
time slots
time
temperature gradient
temperature
cycle
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US12/096,837
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US20090000472A1 (en
Inventor
Karsten Viereck
Reiner Brill
Kai Haemel
Alexander Lodig
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Maschinenfabrik Reinhausen GmbH
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Maschinenfabrik Reinhausen GmbH
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Assigned to MASCHINENFABRIK REINHAUSEN GMBH reassignment MASCHINENFABRIK REINHAUSEN GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VIERECK, KARSTEN, BRILL, REINER, HAEMEL, KAI, LODIG, ALEXANDER
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0454—Controlling adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0462—Temperature swing adsorption

Definitions

  • the invention relates to a method of drying an air dehumidifier filled with moisture-absorbing material for oil-insulated transformers, chokes, or tap changers.
  • European Patent EP 1,313,112 [U.S. Pat. No. 6,709,496] discloses an air dehumidifier of the above-described type in which an electric heater is provided to heat up and thereby dry the regenerable absorption agent. It is possible in this way to redry the absorption agent when saturated and thereby to make it ready for further liquid uptake.
  • the electric heater in this case is actuated by a moisture sensor mounted in the air dehumidifier when a threshold value is exceeded.
  • German Patent DE 103 57 085 [US 2007/0199443] further discloses a method of dehumidifying with a heatable air dehumidifier of this type.
  • the electric heater for heating up and drying the regenerable granules is only actuated here when the moisture sensor signals that a moisture limit has been exceeded and also when there is no air flowing into the oil expansion tank.
  • actuation of the heater is permitted only when no air inflow is present or when air is escaping from the oil expansion tank, but never when air is entering the oil expansion tank.
  • the object of the invention to provide a method of drying an air dehumidifier where sensors of this type can be eliminated and nevertheless it can be assured with simple technical means that heating up and the resultant drying of the absorption agent occur only when no air is entering the oil expansion tank.
  • the method of attaining the object is based on the general inventive idea that a power transformer with an increasing load becomes warmer than its environment and, therefore, the outward flowing air from the transformer is warmer than the outside air.
  • the method of the invention entails determining whether air flows or does not flow from the interior to the exterior by determining the temperature gradient, i.e. the temperature profile, of the measured air within the system. Only a single temperature sensor, which is expediently disposed in the intake of the expansion tank, is required to carry out the method. If the temperature gradient is positive, air is flowing out of the expansion tank; the transformer “breathes out.” Heating can be performed in such a case, or, when the temperature gradient is 0, signifying that there is no airflow.
  • FIG. 1 shows the method of the invention in the time sequence of the process steps.
  • FIG. 2 shows a schematic tabular diagram of a data set within the scope of the method of the invention.
  • the temperature ⁇ 1 at the intake to the expansion tank of the transformer or tap changer is determined and temporarily stored.
  • this time of the temperature measurement is designated by the .
  • the temperature in the intake to the expansion tank is again determined.
  • this temperature is designated as ⁇ 2 , and the time with t h+1 .
  • the temperature ⁇ 1 determined at the beginning of the hour is subtracted from the temperature ⁇ 2 determined at the end of the hour, and the result is stored as the temperature gradient d ⁇ /dt.
  • d ⁇ /dt is greater than or equal to 0. If this is the case, this means that it had become warmer in the intake over the course of the hour at whose start and end a measurement was made; the method of the invention, has therefore determined that warm air has flowed out and the transformer or tap changer has “breathed out.” If the temperature gradient is equal to 0, this means that no air exchange has occurred. In both cases, heating of the absorbing material would be possible.
  • this time slot t h . . . h+1 is stored.
  • This temperature measurement and subsequent gradient formation are then repeated constantly for a first cycle.
  • the invention is illustrated using the example that in each case an entire day a is selected for this cycle.
  • the temperature measurement and subsequent gradient calculation are then constantly repeated for each hour of the 24 hours of the first day a until all 24 hours have been covered.
  • a time slot t h . . . h+1 corresponds precisely to an hour.
  • this cyclic temperature measurement and gradient formation are repeated for other time intervals, here days, for example, 3 days.
  • the time slots in which the temperature gradient is greater than or equal to 0 are stored in the described manner.
  • the temperature gradient is determined for each hour and the time intervals of a positive temperature gradient or a temperature gradient that is precisely 0 are stored.
  • a temperature gradient “1” is greater than or equal to 0, and “0” means a negative temperature gradient.
  • the hourly temperature measurement and the subsequent gradient formation have produced a value of “1” in different time slots. This also occurs on subsequent days in other time slots. It is determined on the fourth day that for the three previous days there are corresponding time slots in the time ranges from 2:00 to 3:00 o'clock [a.m.], 3:00 to 4:00 o'clock, 4:00 to 5:00 o'clock, and 5:00 to 6:00 o'clock, thus four consecutive time slots. Accordingly, heating begins on the fourth day at 2:00 o'clock. The method can restart when the determined moisture value was exceeded or an pause time, which will still be discussed further hereinafter, has elapsed.
  • an operating time greater than the number of considered cycles, here x days, is provided, after which heating takes place in all cases and independent of gradient calculation. Guaranteed heating is achieved by this safety measure, also when in the extreme case no corresponding time slots can be found for a specified time interval due to unfavorable weather conditions, e.g. very high humidity or strong solar irradiation.
  • This method is suitable in an especially advantageous manner for providing condition-based heating in conjunction with the moisture sensor, known from the above-described related art, inside the air dehumidifier.
  • the moisture sensor sets a threshold value for the moisture at which the granules must be heated; the heating is then initiated by the method of the invention in the next valid time slot, characterized by a positive temperature gradient during a corresponding time slot of the previous time intervals.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Gases (AREA)
  • Drying Of Solid Materials (AREA)
  • Transformer Cooling (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
US12/096,837 2006-03-02 2007-01-31 Method of drying an air dehumidifier Active 2027-10-24 US7833312B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102006009668.1 2006-03-02
DE102006009668A DE102006009668B3 (de) 2006-03-02 2006-03-02 Verfahren zur Trocknung eines Luftentfeuchters
DE102006009668 2006-03-02
PCT/EP2007/000803 WO2007098840A1 (de) 2006-03-02 2007-01-31 Verfahren zur trocknung eines luftentfeuchters

Publications (2)

Publication Number Publication Date
US20090000472A1 US20090000472A1 (en) 2009-01-01
US7833312B2 true US7833312B2 (en) 2010-11-16

Family

ID=37887309

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/096,837 Active 2027-10-24 US7833312B2 (en) 2006-03-02 2007-01-31 Method of drying an air dehumidifier

Country Status (12)

Country Link
US (1) US7833312B2 (ko)
EP (1) EP1989717B1 (ko)
JP (1) JP5164864B2 (ko)
KR (1) KR101351868B1 (ko)
CN (1) CN101356600B (ko)
AT (1) ATE434258T1 (ko)
CA (1) CA2637899C (ko)
DE (2) DE102006009668B3 (ko)
ES (1) ES2327465T3 (ko)
HK (1) HK1122396A1 (ko)
PT (1) PT1989717E (ko)
WO (1) WO2007098840A1 (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2749343A1 (en) 2012-12-31 2014-07-02 Qualitrol Company, Llc Methods of regenerating desiccant in a breathing apparatus
US10612852B2 (en) * 2018-01-11 2020-04-07 Fortune Electric Co., Ltd. Transformer system and control method of air-drying device thereof

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2514511B1 (en) * 2011-04-20 2019-07-31 ABB Schweiz AG Air dehydrating breather assembly for providing dehumidified air to electrical devices, and related method
DE102018213341A1 (de) * 2018-08-08 2020-02-13 Siemens Aktiengesellschaft Ermittlung des Feuchteintrags in ein Trocknungsmittel bei Transformatoren
CN111721433A (zh) * 2019-03-18 2020-09-29 宁波奥克斯高科技有限公司 一种变压器的湿度状态智能控制方法

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE18928C (de) G. A. WEISSENHAGEN in Berlin Neuerungen an Winden
DE1063703B (de) 1957-01-17 1959-08-20 Herbert Thederan Anordnung zum Reaktivieren des Trockenmittels in der Trockenvorlage von Transformatoren
US4023940A (en) * 1975-07-02 1977-05-17 Whitlock, Inc. Regeneration cycle control for industrial air dryer
US4135101A (en) * 1977-07-08 1979-01-16 Power Monitors, Inc. Method and apparatus for controlling loads in electric power systems by reduction of peak loads
US4171624A (en) * 1976-04-16 1979-10-23 Gershon Meckler Associates, P.C. Air conditioning apparatus
US20030089238A1 (en) * 2001-11-13 2003-05-15 Messko Albert Hauser Gmbh & Co. Kg Air demoisturizer for oil-insulated transformers, chokes and tap changers
US20030233941A1 (en) * 2002-06-25 2003-12-25 Cooper Turbocompressor, Inc. Energy efficient desiccant dryer regeneration system
US20060086120A1 (en) * 2004-10-26 2006-04-27 Yasuhiro Kashirajima Dehumidifying system
US20070180844A1 (en) * 2004-03-31 2007-08-09 Daikin Industries, Ltd. Air conditioning system
US20070199443A1 (en) 2003-12-06 2007-08-30 Maschinenfabrik Reinhausen Gmbh Method For Dehumidifying Air And Air Dehumidifier For Oil-Insulated Transformers, Reactance Coils And Step Switches

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD18928A (ko) *
JPS60198710A (ja) * 1984-03-23 1985-10-08 Toshiba Corp 油入電器の吸湿呼吸装置
CN2072721U (zh) * 1990-09-21 1991-03-06 叶冰 高压互感器防潮防爆装置
US7332015B2 (en) * 2002-09-06 2008-02-19 Waukesha Electric Systems, Inc Automatic dehydrating breather apparatus and method
DE10315719B3 (de) * 2003-04-04 2004-12-23 Maschinenfabrik Reinhausen Gmbh Luftentfeuchter für ölisolierte Transformatoren, Drosselspulen sowie Stufenschalter

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE18928C (de) G. A. WEISSENHAGEN in Berlin Neuerungen an Winden
DE1063703B (de) 1957-01-17 1959-08-20 Herbert Thederan Anordnung zum Reaktivieren des Trockenmittels in der Trockenvorlage von Transformatoren
US4023940A (en) * 1975-07-02 1977-05-17 Whitlock, Inc. Regeneration cycle control for industrial air dryer
US4171624A (en) * 1976-04-16 1979-10-23 Gershon Meckler Associates, P.C. Air conditioning apparatus
US4135101A (en) * 1977-07-08 1979-01-16 Power Monitors, Inc. Method and apparatus for controlling loads in electric power systems by reduction of peak loads
US20030089238A1 (en) * 2001-11-13 2003-05-15 Messko Albert Hauser Gmbh & Co. Kg Air demoisturizer for oil-insulated transformers, chokes and tap changers
US6709496B2 (en) * 2001-11-13 2004-03-23 Messko Albert Hauser Gmbh & Co. Kg Air demoisturizer for oil-insulated transformers, chokes and tap changers
US20030233941A1 (en) * 2002-06-25 2003-12-25 Cooper Turbocompressor, Inc. Energy efficient desiccant dryer regeneration system
US20070199443A1 (en) 2003-12-06 2007-08-30 Maschinenfabrik Reinhausen Gmbh Method For Dehumidifying Air And Air Dehumidifier For Oil-Insulated Transformers, Reactance Coils And Step Switches
US20070180844A1 (en) * 2004-03-31 2007-08-09 Daikin Industries, Ltd. Air conditioning system
US20060086120A1 (en) * 2004-10-26 2006-04-27 Yasuhiro Kashirajima Dehumidifying system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2749343A1 (en) 2012-12-31 2014-07-02 Qualitrol Company, Llc Methods of regenerating desiccant in a breathing apparatus
US8871005B2 (en) 2012-12-31 2014-10-28 Qualitrol Company, Llc Methods of regenerating desiccant in a breathing apparatus
US10612852B2 (en) * 2018-01-11 2020-04-07 Fortune Electric Co., Ltd. Transformer system and control method of air-drying device thereof

Also Published As

Publication number Publication date
US20090000472A1 (en) 2009-01-01
PT1989717E (pt) 2009-07-08
KR20080103502A (ko) 2008-11-27
CA2637899C (en) 2013-01-22
WO2007098840A1 (de) 2007-09-07
CA2637899A1 (en) 2007-09-07
ES2327465T3 (es) 2009-10-29
DE502007000903D1 (de) 2009-07-30
DE102006009668B3 (de) 2007-04-12
JP5164864B2 (ja) 2013-03-21
EP1989717B1 (de) 2009-06-17
JP2009528156A (ja) 2009-08-06
CN101356600A (zh) 2009-01-28
EP1989717A1 (de) 2008-11-12
CN101356600B (zh) 2011-09-28
HK1122396A1 (en) 2009-05-15
KR101351868B1 (ko) 2014-01-15
ATE434258T1 (de) 2009-07-15

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